C# Need help with code

Styles 2. What does the following code snippet do (or what happens to x and y after the two assignment statements)? Briefly explain the algorithm. double x = 3.2, y = 5.8; X = x + y; y = X-y; x = x - y; 3. Use an if-else statement to write a method that finds the median three double numbers. Note that the return type of your method is double. (need help with code)